feat: amber indicator during post-close wind-down buffer

Parks in the 1-hour buffer after scheduled close now show amber instead
of green: the dot on the desktop calendar turns yellow, and the mobile
card badge changes from "Open today" (green) to "Closing" (amber).

- getOperatingStatus() replaces isWithinOperatingWindow's inline logic,
  returning "open" | "closing" | "closed"; isWithinOperatingWindow now
  delegates to it so all callers are unchanged
- closingParkIds[] is computed server-side and threaded through
  HomePageClient → WeekCalendar/MobileCardList → ParkRow/ParkCard
- New --color-closing-* CSS variables mirror the green palette in amber

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/HomePageClient.tsx

@@ -19,6 +19,7 @@ interface HomePageClientProps {
   data: Record<string, Record<string, DayData>>;
   rideCounts: Record<string, number>;
   coasterCounts: Record<string, number>;
+  closingParkIds: string[];
   hasCoasterData: boolean;
   scrapedCount: number;
 }
@@ -31,6 +32,7 @@ export function HomePageClient({
   data,
   rideCounts,
   coasterCounts,
+  closingParkIds,
   hasCoasterData,
   scrapedCount,
 }: HomePageClientProps) {
@@ -165,6 +167,7 @@ export function HomePageClient({
                 today={today}
                 rideCounts={activeCounts}
                 coastersOnly={coastersOnly}
+                closingParkIds={closingParkIds}
               />
             </div>
 
@@ -177,6 +180,7 @@ export function HomePageClient({
                 grouped={grouped}
                 rideCounts={activeCounts}
                 coastersOnly={coastersOnly}
+                closingParkIds={closingParkIds}
               />
             </div>
           </>

components/MobileCardList.tsx

@@ -10,9 +10,10 @@ interface MobileCardListProps {
   today: string;
   rideCounts?: Record<string, number>;
   coastersOnly?: boolean;
+  closingParkIds?: string[];
 }
 
-export function MobileCardList({ grouped, weekDates, data, today, rideCounts, coastersOnly }: MobileCardListProps) {
+export function MobileCardList({ grouped, weekDates, data, today, rideCounts, coastersOnly, closingParkIds }: MobileCardListProps) {
   return (
     <div style={{ display: "flex", flexDirection: "column", gap: 20, paddingTop: 14 }}>
       {Array.from(grouped.entries()).map(([region, parks]) => (
@@ -54,6 +55,7 @@ export function MobileCardList({ grouped, weekDates, data, today, rideCounts, co
                 today={today}
                 openRideCount={rideCounts?.[park.id]}
                 coastersOnly={coastersOnly}
+                isClosing={closingParkIds?.includes(park.id)}
               />
             ))}
           </div>

components/ParkCard.tsx

@@ -10,11 +10,12 @@ interface ParkCardProps {
   today: string;
   openRideCount?: number;
   coastersOnly?: boolean;
+  isClosing?: boolean;
 }
 
 const DOW = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
 
-export function ParkCard({ park, weekDates, parkData, today, openRideCount, coastersOnly }: ParkCardProps) {
+export function ParkCard({ park, weekDates, parkData, today, openRideCount, coastersOnly, isClosing }: ParkCardProps) {
   const openDays = weekDates.filter((d) => parkData[d]?.isOpen && parkData[d]?.hoursLabel);
   const tzAbbr = getTimezoneAbbr(park.timezone);
   const isOpenToday = openDays.includes(today);
@@ -60,17 +61,17 @@ export function ParkCard({ park, weekDates, parkData, today, openRideCount, coas
           <div style={{ display: "flex", flexDirection: "column", alignItems: "flex-end", gap: 5, flexShrink: 0 }}>
           {isOpenToday ? (
             <div style={{
-              background: "var(--color-open-bg)",
-              border: "1px solid var(--color-open-border)",
+              background: isClosing ? "var(--color-closing-bg)" : "var(--color-open-bg)",
+              border: `1px solid ${isClosing ? "var(--color-closing-border)" : "var(--color-open-border)"}`,
               borderRadius: 20,
               padding: "4px 10px",
               fontSize: "0.65rem",
               fontWeight: 700,
-              color: "var(--color-open-text)",
+              color: isClosing ? "var(--color-closing-text)" : "var(--color-open-text)",
               whiteSpace: "nowrap",
               letterSpacing: "0.03em",
             }}>
-              Open today
+              {isClosing ? "Closing" : "Open today"}
             </div>
           ) : (
             <div style={{
@@ -89,7 +90,7 @@ export function ParkCard({ park, weekDates, parkData, today, openRideCount, coas
           {isOpenToday && openRideCount !== undefined && (
             <div style={{
               fontSize: "0.65rem",
-              color: "var(--color-open-hours)",
+              color: isClosing ? "var(--color-closing-hours)" : "var(--color-open-hours)",
               fontWeight: 500,
               textAlign: "right",
             }}>

components/WeekCalendar.tsx

@@ -12,6 +12,7 @@ interface WeekCalendarProps {
   grouped?: Map<Region, Park[]>; // pre-grouped parks (if provided, renders region headers)
   rideCounts?: Record<string, number>; // parkId → open ride/coaster count for today
   coastersOnly?: boolean;
+  closingParkIds?: string[]; // parks in the post-close wind-down buffer
 }
 
 const DOW = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
@@ -188,6 +189,7 @@ function ParkRow({
   parkData,
   rideCounts,
   coastersOnly,
+  closingParkIds,
 }: {
   park: Park;
   parkIdx: number;
@@ -196,9 +198,11 @@ function ParkRow({
   parkData: Record<string, DayData>;
   rideCounts?: Record<string, number>;
   coastersOnly?: boolean;
+  closingParkIds?: string[];
 }) {
   const rowBg = parkIdx % 2 === 0 ? "var(--color-bg)" : "var(--color-surface)";
   const tzAbbr = getTimezoneAbbr(park.timezone);
+  const isClosing = closingParkIds?.includes(park.id) ?? false;
   return (
     <tr
       className="park-row"
@@ -234,9 +238,11 @@ function ParkRow({
                   width: 7,
                   height: 7,
                   borderRadius: "50%",
-                  background: "var(--color-open-text)",
+                  background: isClosing ? "var(--color-closing-text)" : "var(--color-open-text)",
                   flexShrink: 0,
-                  boxShadow: "0 0 5px var(--color-open-text)",
+                  boxShadow: isClosing
+                    ? "0 0 5px var(--color-closing-text)"
+                    : "0 0 5px var(--color-open-text)",
                 }} />
               )}
             </div>
@@ -245,7 +251,7 @@ function ParkRow({
             </div>
           </div>
           {rideCounts?.[park.id] !== undefined && (
-            <div style={{ fontSize: "0.72rem", color: "var(--color-open-hours)", fontWeight: 600, whiteSpace: "nowrap", flexShrink: 0 }}>
+            <div style={{ fontSize: "0.72rem", color: isClosing ? "var(--color-closing-hours)" : "var(--color-open-hours)", fontWeight: 600, whiteSpace: "nowrap", flexShrink: 0 }}>
               {rideCounts[park.id]} {coastersOnly
                 ? (rideCounts[park.id] === 1 ? "coaster" : "coasters")
                 : (rideCounts[park.id] === 1 ? "ride" : "rides")} operating
@@ -266,7 +272,7 @@ function ParkRow({
   );
 }
 
-export function WeekCalendar({ parks, weekDates, data, grouped, rideCounts, coastersOnly }: WeekCalendarProps) {
+export function WeekCalendar({ parks, weekDates, data, grouped, rideCounts, coastersOnly, closingParkIds }: WeekCalendarProps) {
   const today = getTodayLocal();
   const parsedDates = weekDates.map(parseDate);
 
@@ -382,6 +388,7 @@ export function WeekCalendar({ parks, weekDates, data, grouped, rideCounts, coas
                   parkData={data[park.id] ?? {}}
                   rideCounts={rideCounts}
                   coastersOnly={coastersOnly}
+                  closingParkIds={closingParkIds}
                 />
               ))}
             </Fragment>